Low friction coatings for dynamically engaging load bearing surfaces
First Claim
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1. An apparatus for a well, comprising:
- first and second components, each having a metal engaging surface that engages the other in a load bearing sliding contact, at least one of the engaging surfaces being textured and thereby defining a textured engaging surface; and
a polymer coating on at least one of the textured engaging surfaces, the polymer coating containing a quantity of stiffening particulates having an average diameter less than 0.5 microns.
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Abstract
A gate valve has a body, the body having a cavity and a flow passage intersecting the cavity. A seat ring is mounted to the body at the intersection of the flow passage and the cavity, the seat ring having an engaging face. A gate in the cavity has an engaging face that slidingly engages the face of the seat ring while being moved between open and closed positions. A polymer coating is on at least one of the faces. The polymer contains a quantity of carbon nanotubes for stiffening.
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Citations
21 Claims
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1. An apparatus for a well, comprising:
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first and second components, each having a metal engaging surface that engages the other in a load bearing sliding contact, at least one of the engaging surfaces being textured and thereby defining a textured engaging surface; and a polymer coating on at least one of the textured engaging surfaces, the polymer coating containing a quantity of stiffening particulates having an average diameter less than 0.5 microns. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for controlling well fluids, comprising:
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a gate valve having a body, the body having a cavity and a flow passage intersecting the cavity; a seat ring mounted to the body at the intersection of the flow passage and the cavity, the seat ring having an engaging face formed of a steel alloy; a gate in the cavity and having an engaging face formed of a steel alloy that slidingly engages the face of the seat ring while being moved between open and closed positions, at least one of the engaging faces of the seat ring and the gate being textured and thereby defining a textured engaging face; and a thermoplastic coating on at least one of the textured engaging faces. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method of forming a coating on a metal load bearing surface, comprising:
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(a) texturing the load bearing surface to create a textured surface finish; (b) mixing with a polymer a quantity of stiffening particulates with a polymer, the stiffening particulates having average diameters less than 0.5 microns;
then(c) applying the polymer to the surface finish to create a coating. - View Dependent Claims (20, 21)
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Specification